Three dimensional hexagonal boron nitride nanosheet decorated carbon nanotube composites (3D h-BNNS/CNTs) have been fabricated through a facile thermal treatment process. h-BNNSs randomly distribute among CNTs to form 3D network structure. The microwave absorption properties of these 3D h-BNNS/CNTs are obviously improved comparing with those of CNTs. And the minimum reflection loss (RL) can reach up to −36.5 dB when the absorber thickness is 2.5 mm for 3D h-BNNS/CNTs1 derived from the precursor with boric acid, urea and CNTs molar ratio of 2:4:1. Besides, the maximum absorption bandwidth (RL ≤ −10 dB) is as large as 4.0 GHz when the absorber thickness drops to 2.0 mm. More important, h-BNNS/CNTs1 has a low density of 112.6 ± 3.6 mg/cm³, which is beneficial for practical applications. The significant enhancement in MA performance of h-BNNS/CNTs is mainly attributed to the improvement of impedance matching, interfacial polarization and multiple scattering after introduction of h-BNNSs.

三维六角形氮化硼纳米片装饰的碳纳米管复合材料（3D h -BNNS / CNTs）已通过一种便捷的热处理工艺制备。h -BNNS随机分布在CNT之间以形成3D网络结构。与CNT相比，这些3D h -BNNS / CNT的微波吸收性能明显改善。当硼酸，尿素和CNT摩尔比为2：4：1的前驱体衍生的3D h -BNNS / CNTs1的吸收体厚度为2.5 mm时，最小反射损耗（RL）可以达到-36.5 dB 。此外，当吸收器厚度降至2.0 mm时，最大吸收带宽（RL≤-10 dB）高达4.0 GHz。更重要的是，h-BNNS / CNTs1具有112.6±3.6 mg / cm ^3的低密度，这对实际应用是有益的。h -BNNS / CNTs MA性能的显着提高主要归因于引入h -BNNSs后阻抗匹配，界面极化和多重散射的改善。